Paper and board - Determination of smoothness

Paper and board smoothness refers to the smoothness of the paper surface, which is usually enhanced by surface coating. The smoothness of paper and board affects how well the surface is printed and coated, and for some applications, its aesthetic appearance. Smoothness is usually measured using air buoyancy instruments or other instruments.

The smoothness of paper and board can be measured using a smoothness meter or the hand feel method.

1. When using a smoothness meter for measurement, the sample to be tested is placed on a fixed test table with a worn steel ball on it. The worn steel ball is driven to roll on the surface of the sample by mechanical means, and different steel balls have different degrees of wear, so the smoothness of the sample surface can be determined by testing the wear rate of the surface.

2. The hand feeling method is a method of evaluating the gloss and smoothness of paper based on the hand feel. Paper is folded and kneaded several times, and its surface and feel are judged for its gloss and smoothness.

Beichao reminds you: the hand feeling method is only an empirical method, and the results may vary from person to person. The smoothness meter is a relatively accurate measurement method, but it requires corresponding equipment and professional skills, and is generally suitable for quality inspection in the paper and cardboard industry.